mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-08 14:20:07 +00:00
581c785bf3
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
72 lines
2.8 KiB
C
72 lines
2.8 KiB
C
/* Helper macros for pointer arithmetic.
|
|
Copyright (C) 2012-2022 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _LIBC_POINTER_ARITH_H
|
|
#define _LIBC_POINTER_ARITH_H 1
|
|
|
|
#include <stdint.h>
|
|
|
|
/* 1 if 'type' is a pointer type, 0 otherwise. */
|
|
# define __pointer_type(type) (__builtin_classify_type ((type) 0) == 5)
|
|
|
|
/* intptr_t if P is true, or T if P is false. */
|
|
# define __integer_if_pointer_type_sub(T, P) \
|
|
__typeof__ (*(0 ? (__typeof__ (0 ? (T *) 0 : (void *) (P))) 0 \
|
|
: (__typeof__ (0 ? (intptr_t *) 0 : (void *) (!(P)))) 0))
|
|
|
|
/* intptr_t if EXPR has a pointer type, or the type of EXPR otherwise. */
|
|
# define __integer_if_pointer_type(expr) \
|
|
__integer_if_pointer_type_sub(__typeof__ ((__typeof__ (expr)) 0), \
|
|
__pointer_type (__typeof__ (expr)))
|
|
|
|
/* Cast an integer or a pointer VAL to integer with proper type. */
|
|
# define cast_to_integer(val) ((__integer_if_pointer_type (val)) (val))
|
|
|
|
/* Cast an integer VAL to void * pointer. */
|
|
# define cast_to_pointer(val) ((void *) (uintptr_t) (val))
|
|
|
|
/* Align a value by rounding down to closest size.
|
|
e.g. Using size of 4096, we get this behavior:
|
|
{4095, 4096, 4097} = {0, 4096, 4096}. */
|
|
#define ALIGN_DOWN(base, size) ((base) & -((__typeof__ (base)) (size)))
|
|
|
|
/* Align a value by rounding up to closest size.
|
|
e.g. Using size of 4096, we get this behavior:
|
|
{4095, 4096, 4097} = {4096, 4096, 8192}.
|
|
|
|
Note: The size argument has side effects (expanded multiple times). */
|
|
#define ALIGN_UP(base, size) ALIGN_DOWN ((base) + (size) - 1, (size))
|
|
|
|
/* Same as ALIGN_DOWN(), but automatically casts when base is a pointer. */
|
|
#define PTR_ALIGN_DOWN(base, size) \
|
|
((__typeof__ (base)) ALIGN_DOWN ((uintptr_t) (base), (size)))
|
|
|
|
/* Same as ALIGN_UP(), but automatically casts when base is a pointer. */
|
|
#define PTR_ALIGN_UP(base, size) \
|
|
((__typeof__ (base)) ALIGN_UP ((uintptr_t) (base), (size)))
|
|
|
|
/* Check if BASE is aligned on SIZE */
|
|
#define PTR_IS_ALIGNED(base, size) \
|
|
((((uintptr_t) (base)) & (size - 1)) == 0)
|
|
|
|
/* Returns the ptrdiff_t diference between P1 and P2. */
|
|
#define PTR_DIFF(p1, p2) \
|
|
((ptrdiff_t)((uintptr_t)(p1) - (uintptr_t)(p2)))
|
|
|
|
#endif
|